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针对黄土高原长期种植苜蓿会导致深层土壤的干层化现象,在陕北黄土丘陵沟壑区的苜蓿种植区采用侧膜种植、播量减半种植、间作种植、常规种植4种种植模式来分析土壤水分环境。研究表明:侧膜种植年内贮水量在各个时期较其它3种模式高,各种植模式有效降雨量与土壤水分补给量之间关系呈线性相关,侧膜种植提高0~180 cm土层土壤水分补给量更为突出。有效降雨对4种种植模式活跃层的贮水补偿作用极显著。春夏失墒期各种模式土壤相对稳定层对活跃层的补偿作用显著,各处理的相对稳定对活跃层补给量之间呈直线正相关,但补给量存在一定差异。
Long-term planting of alfalfa in the Loess Plateau will result in the phenomenon of dry layering of deep soil. In the alfalfa planting area of the loess hilly and gully region of northern Shaanxi, lateral membrane planting, half-sowing seeding, intercropping and conventional planting are used to analyze soil Water environment. The results showed that the water storage capacity of lateral membrane planting was higher than that of the other three patterns in all periods, and the correlation between the effective rainfall of each planting pattern and the recharge of soil moisture was linear. The lateral membrane planting increased soil water recharge at 0 ~ 180 cm soil layer The amount is more prominent. Effective rainfall has a significant effect on the water storage compensation of active layers in the four planting modes. The spring and summer loss of moisture periods of various modes of soil relative stable layer compensation for the active layer significant role in the relative stability of the active layer recharge was a linear correlation, but the supply there is a certain difference.